cricket 9% 6:41 PM X Chapter 7: Central Limit Theo... amoun תויc eIG пе average spend at Don Mcalds fast food place is $7.5800 witha standard deviation of $1.6800. 12 customers are randomly selected. Please answer the following questions, and round all answers to 4 decimal places where possible and assume a normal distribution. τπΟΠey OT a. What is the distribution of X? X~ N(7.5800 1.6800 b. What is the distribution of ? x ^ N(7.5800 0.4849 C. What is the distribution of * х? Σ N( d. What is the probability that one randomly selected customer will spend less than $8.2425? e. For the 12 customers, find the probability that their average spent is more than $8.2425. f. Find the probability that the randomly selected 12 customers will spend more than $98.9100 g. For part e) and f), is the assumption of normal necessary? h. The owner of Don Mcalds gives a coupon for a free sundae to the 4% of all groups of 12 people who spend the most money. At least how much must a Yes No of 12 spend in total to the get group free sundae? $|
Addition Rule of Probability
It simply refers to the likelihood of an event taking place whenever the occurrence of an event is uncertain. The probability of a single event can be calculated by dividing the number of successful trials of that event by the total number of trials.
Expected Value
When a large number of trials are performed for any random variable ‘X’, the predicted result is most likely the mean of all the outcomes for the random variable and it is known as expected value also known as expectation. The expected value, also known as the expectation, is denoted by: E(X).
Probability Distributions
Understanding probability is necessary to know the probability distributions. In statistics, probability is how the uncertainty of an event is measured. This event can be anything. The most common examples include tossing a coin, rolling a die, or choosing a card. Each of these events has multiple possibilities. Every such possibility is measured with the help of probability. To be more precise, the probability is used for calculating the occurrence of events that may or may not happen. Probability does not give sure results. Unless the probability of any event is 1, the different outcomes may or may not happen in real life, regardless of how less or how more their probability is.
Basic Probability
The simple definition of probability it is a chance of the occurrence of an event. It is defined in numerical form and the probability value is between 0 to 1. The probability value 0 indicates that there is no chance of that event occurring and the probability value 1 indicates that the event will occur. Sum of the probability value must be 1. The probability value is never a negative number. If it happens, then recheck the calculation.
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